Pet sitting/Dog walking may be a good way to go. I don't know what you may resonaablly be able to charge there, but here when I was looking for a sitter for the girls people were asking $15-20 /day If you could offer the option of keeping the people's pets at their home and add in water plants, getting mail etc, you may make some good money and not have to add the extra stree to your family/dogs of having the other dogs in your home.

Good Luck!